Some of these people are tourists, but tbf plenty of weebs and other nerds are susceptible to going full-shitlib because they see it as their ticket to respectsbility. SJWs have done a great job of reframing selling out as "evolving" or "growing up," and while plenty of edgy people are edgy because they genuinely despise polite society in its current form (such as us), plenty of edgelords will flip the moment they're finally invited to the cocktail parties.

Troll's Remorse is a helluva drug, often times it's as simple as a guy like idubbbz getting a shitlib gf, but more generally a lot of people who grew up as the bullied outcasts will jump at the opportunity to have a seat at the cool kids' table once they're "adults."

Put more bluntly, normies don't spend their time sabotaging anime dialogue out of a petty vendetta towards anti-SJWs. Normies aren't the types to get offended at video game boobs or "sexist" jokes. Only neurotic activist types do that shit, and the most vicious bullies are losers desperate to prove that they're not losers.